Chemoselective Suzuki–Miyaura reactions of 4-trifluoromethylsulfonyloxy-6-bromocoumarin
摘要:
Suzuki-Miyaura reactions of 4-trifluoromethylsulfonyloxy-6-bromocoumarin provide a convenient access to arylated coumarins. The reactions proceed with excellent chemoselectivity in favour of position 4. (C) 2012 Elsevier Ltd. All rights reserved.
Coumarins from Free <i>ortho</i>-Hydroxy Cinnamates by Heck-Matsuda Arylations: A Scalable Total Synthesis of (<i>R</i>)-Tolterodine
作者:Daniela A. Barancelli、Airton G. Salles、Jason G. Taylor、Carlos Roque D. Correia
DOI:10.1021/ol302923f
日期:2012.12.7
Free ortho-hydroxy cinnamate ester derivatives are evaluated in the synthesis of structurally diverse 4-aryl-coumarins via a tandem Heck-Matsuda cyclization reaction. Free phenolic groups were considered incompatible with such a reaction, which usually provide the corresponding diazo dyes. A concise and scalable route employing a ligand-free, Pd-catalyzed Heck-Matsuda arylation under aerobic conditions